The relative lowering of vapour pressure of a dilute aqueous solution containing non-volatile solute is 0.0125. The molality of the solution is about

• 0.70

• 0.50

• 0.90

• 0.80

The activation energy of exothermic reaction A → B is 80 kJ mo1^-1. The heat of reaction is 200 kJ mol^-1. The activation evergy for the reaction B → A (in kJ mol^-1) will be

• 280

• 200

• 120

• 40

The strongest base among the following is

• C₆H₅NH₂

• (C₆H₅)₂NH

• NH₃

• (C₂H₅)₂NH

The radius of the first Bohr orbit of hydrogen atom is 0.529 Å. The radius of the third orbit of H⁺ will be

• 8.46 Å

• 0.705 Å

• 1.59 Å

• 4.29 Å

Which diagram best represents the appearance of the line spectrum of atomic hydrogen in the visible region?

Which of the following is paramagnetic with bond order 0.5?

• F₂

• H${}_2^{+}$

• N₂

• O${}_2^{-}$

Match List-I with List-II and choose the correct matching codes from the choices given.

List - I	List - II
A. PCl5	1. Linear
B. IF7	2. Pyramidal
C. H3O+	3. Trigonal bipyramidal
D. ClO2	4. Tetrahedral
E. NH${}_4^{+}$	5. Pentagonal bipyramidal 6. Angular

• A - 3; B - 5; C - 2; D - 1; E - 4

• A - 3; B - 5; C - 4; D - 1; E - 2

• A - 3; B - 5; C - 6; D - 1; E - 2

• A - 3; B - 5; C - 2; D - 6; E - 4

8.

Which one of the following volume (V)- temperature (T) plots represents the behaviour of one mole of an ideal gas at one atmospheric pressure?

• 

• 

• 

• 

In which one of the following pairs the radius of the second species is greater than that of the first?

• Na, Mg

• O^2-, N^3-

• Li⁺, Be²⁺

• Ba²⁺, Sr²⁺

Match List-I with List-II Choose the correct matching codes from the choices given.

List - I (Hydride)	List - II (Type of hydride)
A. BeH2	1. Complex
B. AsH3	2. Lewis acid
C. B2H6	3. Interstitial
D. LaH3	4. Covalent
E. LiAlH4	5. Intermediate 6. Ionic

• A - 6; B - 2; C - 4; D - 5; E - 1

• A - 5; B - 4; C - 2; D - 3; E - 1

• A - 6; B - 4; C - 2; D - 3; E - 5

• A - 6; B - 4; C - 2; D - 3; E - 1